Not many components live on their own, without any dependencies on others. Instead of tightly coupling them, we can improve the separation of concerns with dependency injection (DI).

Many languages contain a REPL, a Read-Evaluate-Print Loop. It evaluates declarations, statements, and expressions as they are entered and immediately shows the results. With Java 9, we finally got one too.

Git is packed with features and some can be very intimidating. So we resort to just using the same few commands we can memorize, over and over again.